Backward Curved Centrifugal Fans

Backward Curved Centrifugal Fans

Backward-curved motorised impellers develop pressure within the envelope of the impeller and do not, therefore, rely on a scroll housing for this purpose. They are relatively low cost and can be simply and cheaply housed.

Air is drawn through a radius inlet ring, which minimises pressure losses and air leakage, and is discharged at 90° to the inlet axis. The impeller has a ‘non-overloading’ characteristic in that it draws maximum power near the centre of its pressure/volume flow curve.

Low-cost speed control is possible by supply voltage variation, either by an electronic (triac) method or by a transformer.

AA High Pressure Centrifugal Fan

Model
Phase
Pole
Code
Pressure
RPM
Rated I (A) 400V
Rated Power kW
Airflow m3/h
Sound dB(A)
Weight
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AA 45/5 T2 2,2kW Three 2 255120106 High Pressure 2800 4,58 2,2 1.680 83 62,5
AA 45/5 T2 3kW Three 2 255120120 High Pressure 2870 5,92 3 2.760 83 69,5
AA 50/5 T2 4kW Three 2 255150106 High Pressure 2890 7,63 4 2.930 86 79
AA 50/5 T2 5,5 kW Three 2 255150120 High Pressure 2900 10,6 5,5 4.650 86 92
AA 60/7 T2 11kW Three 2 255520120 High Pressure 2930 20,8 11 5.480 90 141

B Wheel Motorised Impeller

GKHR (xxx) CIE – Motorised Impeller (EC)
GKHM (xxx) CIE – Fan Module / Plug Type (EC)

EKHR / DKHR – Motorised Impeller (AC)
EKHM / DKHM – Fan Module (AC)

Fan Type
Voltage (V)
Frequency (Hz)
Input Power (kW)
Rated Current (A)
Speed (rpm)
Max Air Temperature (°C)
IP Rating (IP)
Sound Power Level dB(A)
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GKHR 315-CIE.088.4EA or GKHM 315-CIE.088.4EA 230 50 / 60 0.5 2.8 2200 40 IP54 69
GKHR 355-CIE.112.4EA or GKHM 355-CIE.112.4EA 230 50 / 60 0.5 2.7 1650 40 IP54 69
GKHR 355-CIE.112.5FA or GKHM 355-CIE.112.5FA 230 50 / 60 1.12 5.0 2250 45 IP54 76
GKHR 355-CIE.112.5FA or GKHM 355-CIE.112.5FA 400 50 / 60 1.70 2.8 2600 40 IP54 79
GKHR 400-CIE.125.4FF or GKHM 400-CIE.125.4FF 230 50 / 60 0.5 2.8 1380 40 IP54 67
GKHR 400-CIE.125.5HF or GKHM 400-CIE.125.5HF 400 50 / 60 1.60 2.5 2100 40 IP54 74
GKHR 400-CIE.125.5FA or GKHM 400-CIE.125.5FA 230 50 / 60 1.16 5.2 1875 40 IP54 73
GKHR 450-CIE.136.5FA or GKHM 450-CIE.136.5FA 230 50 / 60 1.15 5.1 1550 40 IP54 71
GKHR500-CIE.154.5HF or GKHM500-CIE.154.5HF 230 50 / 60 1.15 5.1 1330 40 IP54 71
GKHR 450-CIE.136.5HF or GKHM 450-CIE.136.5HF 400 50 / 60 1.65 2.7 1775 40 IP54 75
GKHR 450-CIE.135.6FF or GKHM 450-CIE.135.6FF 400 50 / 60 3.50 5.1 2300 40 IP54 84
GKHR 450-CIE.135.6FF or GKHM 450-CIE.135.6FF 400 50 / 60 1.50 2.4 1425 40 IP54 80
GKHR 500-CIE.154.6FF or GKHM 500-CIE.154.6FF 400 50 / 60 2.90 4.4 1800 60 IP54 80
GKHR 560-CIE.175.6IF or GKHM 560-CIE.175.6IF 400 50 / 60 3.26 5.0 1550 50 IP54 80
EKHR315-4_E088.4EC or EKHM315-4_E088.4EC 230 50 0.145 0.70 1370 70 IP54 58
DKHR315-4_E088.4EC or DKHM315-4_E088.4EC 400 50 0.15 0.36 1390 70 IP54 58
EKHR355-4_E112.5FA or EKHM355-4_E112.5FA 230 50 0.31 1.50 1400 50 IP54 63
DKHR335-4_E112.5DF or DKHM335-4_E112.5DF 400 50 0.29 0.67 1385 60 IP54 63
EKHR400-4_E125.5FA or EKHM400-4_E125.5FA 230 50 0.55 2.60 1390 65 IP54 64
DKHR400-4_E125.5FA or DKHM400-4_E125.5FA 400 50 0.49 0.93 1345 70 IP54 64
EKHR450-4_E136.6FA or EKHM450-4_E136.6FA 230 50 0.92 4.36 1410 45 IP54 69
DKHR450-4_E136.6FA or DKHM450-4_E136.6FA 400 50 0.88 1.88 1400 65 IP54 69
EKHR500-4_E154.6HF or EKHM500-4_E154.6HF 230 50 1.49 6.80 1385 40 IP54 72
DKHR500-4_E154.6HF or DKHM500-4_E154.6HF 400 50 1.40 2.90 1395 70 IP54 72
DKHR560-4_E175.6LA or DKHM560-4_E175.6LA 400 50 2.20 4.30 1330 50 IP54 72

E Wheel Motorised Impeller

GKHR (xxx) CIB – Motorised Impeller (EC)
GKHM (xxx) CIB – Fan Module / Plug Type (EC)

GKHB (xxx) CEB – Mounting Stand (EC)

Fan Type
Article Number
Voltage (V)
Frequency (Hz)
Input Power (kW)
Rated Current (A)
Fan Speed (min-1)
Max Air Temperature (°C)
IP Rating (IP)
GKHR (kg)
GKHM (kg)
GKHB (kg)
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GKHR250-CIB.080.4EA IE or GKHM250-CIB.080.4EA N86-25300 or N88-25300 Single Phase 230 V 50 / 60 0.48 2.8 2850 40/60 IP54 5.2 11
GKHR280-CIB.090.5FA IE or GKHM280-CIB.090.5FA IE N86-28303 or N88-28303 Single Phase 230 V 50 / 60 1.1 6.3 3000 40/60 IP54 10 16
GKHR280-CIB.090.5FA or GKHM280-CIB.090.5FA N86-28301 or N88-28301 3 Phase 400 V 50 / 60 1.6 2.5 3500 40/60 IP54 10 16
GKHR 315-CIB.100.4EA IE or GKHM 315 CIB 100 4EA Single Phase 230V 50 / 60 0.43 2.5 1850 40/60 IP54 6 14
GKHR 315-CIB.100.5FA IE or GKHM 315-CIB.100.5FA N86-31801 or N88-31801 Single Phase 230 V 50 / 60 1.0 6.2 2400 40/60 IP54 10.5 18.5
GKHR 315-CIB.100.5FA IE or GKHM 315-CIB.100.5FA N86-31804 or N88-31804 3 Phase 400 V 50 / 60 1.6 2.6 2900 40/60 IP54 10.5 18.5
GKHR 355-CIB.112.6FF IE or GKHM 355-CIB.112.6FF N86-35801 or N88-35801 3 Phase 400 V 50 / 60 3.3 4.8 3000 40/60 IP54 21 31
GKHR 400-CIB.125.6FF IE or GKHM 400-CIB.125.6FF IE N86-40300 or N88-40300 3 Phase 400 V 50 / 60 3.5 5.3 2600 40/60 IP54 21.5 38
GKHR 450 CIB.140.6IF or GKHM 450 CIB.140.6IF N86-45300 or N88-45300 3 Phase 230 V 50 / 60 3.6 5.2 2150 40/60 IP54 27 47
GKHR 450 CIB.140.6IF or GKHM 450 CIB.140.6IF N88-45350 3 Phase 400 V 50 3.3 8.4 2050 40/60 IP54 68
GKHR 500-CIB.160.6IF IE or GKHM 500-CIB.160.6IF IE N86-50300 or N88-50300 3 Phase 400 V 50 / 60 3.6 5.3 1750 40/60 IP54 28 55
GKHR560-CIB.180.6IF IE or GKHM560-CIB.180.6IF IE N86-56300 or N-8856300 3 Phase 400 V 50 / 60 3.3 4.8 1450 40/60 IP54 30 62
GKHR 630-CIB.200.6NA IE or GKHM 630-CIB.200.6NA IE N86-63302 or N88-63302 3 Phase 230 V 50 / 60 3.1 7.7 1140 40/60 IP54 37 74
GKHR 630-CIB.200.6NA IE or GKHM 630-CIB.200.6NA IE N86-63301 or N88-63301 3 Phase 400 V 50 / 60 3.3 5.0 1181 40/60 IP54 37 74
GHKB 630-CEB.200.8LA N88-63350 3 Phase 400 V 50 6.6 9.8 1500 40/60 IP54 107
GKHB 710 CEB 200 8LA N88-71352 3 Phase 400 V 50 6.9 11.0 1280 40/60 IP54 107

RRE & RRM Motorised Impellers

RRE – Motorised Impeller
RRM – Fan Module With Mounting Stand

Fan Type
Article Number
Voltage (V)
Frequency (Hz)
Motor Power Input (kW)
Rated Current (A)
Fan Speed (min-1)
Max Air Temperature (°C)
IP Rating (IP)
RRE (kg)
RRM (kg)
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RRE G9 192x40R or RRM G9 192X40R K49-A4-1 or L38-B2-1 230 50 / 60 0.14 1.15 3990 50 IP4X 1.2 1.5
RRE G9 225x63R or RRM G9 225x63R K49-A6-1 or L38-B4-1 230 50 / 60 0.150 1.19 2780 50 IP4x 1.7 3.0
RRE G9 225x50R 230 50 / 60 0.121 1.0 3350 50 IP4x 1.7

MBC High Temperature Backward Curved Centrifugal Fans

Model
Phase
Poles
Code
RPM
Rated I (A) 230V
Rated I (A) 400V
Rated Power kW
Airflow m3/h
Sound dB(A)
Weight
Request a Quote
MBC 25/10 M4 1,1 kW Single 2 253310143 1400 7,45 1,1 2.530 60 63
MBC 25/10 M5 0,55kW Single 6 253300143 890 3,9 0,55 1.670 56 61
MBC 28/11 M6 0,75kW Single 6 253380143 900 4,9 0,75 2.300 58 67
MBC 25/10 T2 2,2kW Three 2 253280146 2800 4,58 2,2 2.550 64 65
MBC 25/10 T2 3kW Three 2 253290146 2870 5,92 3 3.700 65 66
MBC 28/11 T2 4kW Three 2 253360146 2890 7,63 4 3.800 68 66
MBC 25/10 T4 1,1kW Three 4 253310146 1400 2,49 1,1 2.530 60 65
MBC 28/11 T4 2,2kW Three 4 253370146 1430 4,64 2,2 3.490 64 710
MBC 31/12 T4 3kW Three 4 253460146 1430 6,17 3 6.160 68 72
MBC 35/14 T4 3kW Three 4 253480146 1430 6,17 3 6.500 72 75
MBC 35/14 T4 5,5kW Three 4 253490146 1440 10,5 5,5 8.290 73 78
MBC 40/16 T4 5,5kW Three 4 253510146 1440 10,5 5,5 9.000 75 87
MBC 40/16 T4 7,5kW Three 4 253520146 1440 14,1 7,5 11.500 77 89
MBC 45/18 T4 5,5kW Three 4 253530146 1440 10,5 5,5 8.500 79 91
MBC 45/18 T4 7,5kW Three 4 253540146 1440 14,1 7,5 9.500 80 93
MBC 25/10 T6 0,55kW Three 6 253300146 900 1,8 0,55 1.670 56 63
MBC 28.11 T6 0,75kW Three 6 253380146 910 1,95 0,75 2.300 58 69
MBC 31/12 T6 1,5kW Three 6 253430146 940 3,71 1,5 4.060 63 71
MBC 35/14 T6 1,5 kW Three 6 253470146 940 3,71 1,5 5.170 67 77
MBC 40/16 T6 2,2 kW Three 6 253500146 940 5,94 2,2 7.150 71 86
MBC 45/18 T6 2,2kW Three 6 253560146 940 5,94 2,2 6.800 75 90

MBRC High Temperature Backward Curved Centrifugal Fans

Model
Phase
Poles
Code
RPM
Rated I (A) 230V
Rated I (A) 400V
Rated Power kW
Airflow m3/h
Sound dB(A)
Weight
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MBRC 40-12 M4 0,75kM Single 4 243400143 1400 5,21 0,75 5.640 59 71
MBRC 45/14 M4 1,1kW Single 4 243450143 1400 7,45 1,1 7.000 62 90
MBRC 50/16 M4 1,5kW Single 4 243510143 1400 9,83 1,5 9.500 64 116
MBRC 50/16 M6 0,75kW Single 6 243500143 900 4,9 0,75 70100 54 116
MBRC 31/10 T2 1,1kW Three 2 24331016 2800 2,33 1,1 4.800 68 42
MBRC 35/11 T2 2,2kW Three 2 243350146 2800 4,58 2,2 6.660 71 55
MBRC 40/12 T2 3kW Three 2 243410146 2870 5,92 3 8.500 74 98
MBRC 40/12 T4 0,75kW Three 4 243400146 1390 1,63 0,75 5.640 59 71
MBRC 45/14 T4 1,1kW Three 4 243450146 1400 2,49 1,1 7.000 62 90
MBRC 50/16 T4 1,5kW Three 4 243510146 1400 3,26 1,5 9.500 64 116
MBRC 56/18 T4 3kW Three 4 243570146 1430 6,17 3 13.500 70 150
MBRC 63/20 T4 5,5kW Three 4 243650146 1440 10,5 5,5 19.000 71 220
MBRC 71/22 T4 7,5kW Three 4 243730146 1440 14,1 7,5 25.500 77 316
MBRC 50/16 T6 0,75kW Three 6 243500146 910 1,95 0,75 7.100 54 116
MBRC 56/18 T6 1,5kW Three 6 243560146 940 3,71 1,5 9.500 61 142
MBRC 63/20 T6 1,1kW Three 6 243640146 940 3,71 1,5 12.000 62 208
MBRC 71/22 T6 3kW Three 6 243720146 960 7,3 3 17.000 68 294

Technical Articles

Read our technical article on What causes an unbalanced impeller?

Applications

Electrical Enclosures Cabinets Axair Online Data Centre
Fan Coil Unit

Products in this Range

B Wheel Motorised Impeller

Designed to increase energy efficiency by up to 6% and reduce noise by 3 decibels

E Wheel Motorised Impeller

Significantly increases energy efficiency and reduces operating noise levels

RRE & RRM Backward Curved Centrifugal Fan

High performance motorised impeller and fan module with efficient EC motors

EHND & EHNE Backward Curved Centrifugal Fan

High efficiency centrifugal fans ideal for the movement of clean or slightly dusty air, gases or steam

NIMUS & NIMAX Medium Pressure Centrifugal Fans

NIMUS and NIMAX fans with air flows of up to 88,000m³ per hour and impeller sizes between 311mm and 1402mm.

AA High Pressure Backward Curved Centrifugal Fans

Straight blade or backward curved impeller designed to achieve high air pressure

MBC & MBRC High Temperature Backward Curved Centrifugal Fans

High temperature fan, moves air up to 250°C, ideal for extracting from ovens

KBAE & KBAD Commercial Kitchen Extraction Fans

Efficient extract units ideal for commercial and industrial kitchen ventilation

RL Box Square Duct Centrifugal Fans

Box fan for inline installation with sound proofing ideal for commercial kitchens

UNOBOX Square Duct Centrifugal Fans

Box fan for inline installation with efficient impeller ideal for commercial kitchens

Influence of E-Wheel Efficient Impeller: Noise and Energy (04/09/2018)

With an ever growing focus on system efficiencies, manufacturers of industrial equipment must take into account individual components to ensure that these key influencing factors achieve the desired energy savings. Replacing inefficient components that are often overlooked in ventilation systems, can result in sizeable gains. A significant component in such systems is an efficient impeller. […]

Casal’s Storm Range Strengthened with Introduction of NIMUS & NIMAX (10/01/2019)

The new NIMAX and NIMUS range of highly efficient, medium pressure, backward curved, single inlet fans form an integral part of the Storm range produced by Axair’s supply partner, Casals Ventilation. The Casals Storm range offers and extremely comprehensive range of industrial fans, which also includes material handling fans and high pressure fans with both […]

Ecofit Ewheel – New EC Backward Curved Centrifugal Fan (19/02/2018)

Designed for low to medium pressure applications, Axair Fans are excited to launch the latest addition to our impressive range of backward curved centrifugal fans with the Ecofit EWheel. Developed and manufactured by supplier partner, Ecofit, the 250 diameter EC Ecofit EWheel supersedes the previous version in both aesthetic design and performance. Over the past […]